#ifndef _LINUX_IOCTL_H
#define _LINUX_IOCTL_H

#define _IOC_NRBITS   8
#define _IOC_TYPEBITS 8

#ifndef _IOC_SIZEBITS
#define _IOC_SIZEBITS 14
#endif

#ifndef _IOC_DIRBITS
#define _IOC_DIRBITS 2
#endif

#define _IOC_NRMASK   ((1 << _IOC_NRBITS) - 1)
#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS) - 1)
#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS) - 1)
#define _IOC_DIRMASK  ((1 << _IOC_DIRBITS) - 1)

#define _IOC_NRSHIFT   0
#define _IOC_TYPESHIFT (_IOC_NRSHIFT + _IOC_NRBITS)
#define _IOC_SIZESHIFT (_IOC_TYPESHIFT + _IOC_TYPEBITS)
#define _IOC_DIRSHIFT  (_IOC_SIZESHIFT + _IOC_SIZEBITS)

#ifndef _IOC_NONE
#define _IOC_NONE 0U
#endif

#ifndef _IOC_WRITE
#define _IOC_WRITE 1U
#endif

#ifndef _IOC_READ
#define _IOC_READ 2U
#endif

#define _IOC(dir, type, nr, size)                          \
  (((dir) << _IOC_DIRSHIFT) | ((type) << _IOC_TYPESHIFT) | \
   ((nr) << _IOC_NRSHIFT) | ((size) << _IOC_SIZESHIFT))

#define _IOC_TYPECHECK(t) (sizeof(t))

#define _IO(type, nr) _IOC(_IOC_NONE, (type), (nr), 0)
#define _IOR(type, nr, size) \
  _IOC(_IOC_READ, (type), (nr), (_IOC_TYPECHECK(size)))
#define _IOW(type, nr, size) \
  _IOC(_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
#define _IOWR(type, nr, size) \
  _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
#define _IOR_BAD(type, nr, size) _IOC(_IOC_READ, (type), (nr), sizeof(size))
#define _IOW_BAD(type, nr, size) _IOC(_IOC_WRITE, (type), (nr), sizeof(size))
#define _IOWR_BAD(type, nr, size) \
  _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), sizeof(size))

#define _IOC_DIR(nr)  (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
#define _IOC_NR(nr)   (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)

#define IOC_IN        (_IOC_WRITE << _IOC_DIRSHIFT)
#define IOC_OUT       (_IOC_READ << _IOC_DIRSHIFT)
#define IOC_INOUT     ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT)
#define IOCSIZE_MASK  (_IOC_SIZEMASK << _IOC_SIZESHIFT)
#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)

#endif /* _LINUX_IOCTL_H */
